This is earth, not Paradise. We all live in corrupted flesh, and we will all die. God promises suffering and death to all people on this earth, including those who are innocent. All living things on earth eventually die.
In the Heavenly Kingdom that will all change for those who remain faithful now in times of turmoil, temptations and sufferings.
Some die earlier of a number of causes - diseases, accidents, crime, drugs, abuse, and some die much later, but that is not God's fault. What matters is, whatever time we do have, we are responsible to be ready when He comes for us.
Luke 21:34-36 (WEB)
34 “So be careful, or your hearts will be loaded down with carousing, drunkenness, and cares of this life, and that day will come on you suddenly. 35 For it will come like a snare on all those who dwell on the surface of all the earth. 36 Therefore be watchful all the time, praying that you may be counted worthy to escape all these things that will happen, and to stand before the Son of Man.”
Babies are innocent, but like all people, they will die. Some babies never get the opportunity to live a full life on earth, but they also escape the struggles of this life, and are guaranteed a place in God's Heavenly Kingdom, because they are innocent.
Blessings